const Koa = require('koa')
const app = new Koa();
const Router = require('koa-router')
const router = new Router({prefix: '/api/users'})

const users = [{name: 'tom', id: 1}, {name:'jerry', id: 2}]

router.get('/:id', ctx => {
  const user = users.find(u => u.id == ctx.params.id);
  if(user) {
    ctx.body = {ok: 1, user}
  } else {
    ctx.body = {ok: 0}
  }
})

app.use(router.routes())
app.listen(3001);